Yep understand network busies, referring to simplex was for those who want to have extended chats - the operational channel is kept clear.
Hypothetical for you, 4 people isolated from main group - got to fireground by boat. Two firies two SES, Two firies have got a couple of 38's out, one SES looking after flotation pump & liaising with SES ground crew( in a nearby town)& CFS base, one SES operating the boat. Firies ask for more hose as they are making good headway, try to get on to CFS base-takes ten minutes due to other traffic. Another ten minutes to get an answer, then more time is lost going over to the other side of river to find more hose, get back to crew, connect hose and start pump. By this time opportunity is lost and crew withdrawn.
Thats what I'm talking about, don't worry our service is just as bad. As you said depends on unit, region etc, that is why we are worried about a regional talk group - nothing gained as base stations will still be on, only less talkgroups to monitor. I know what you are saying ltdan, thats why training people properly in the first place is so important & shouldn't be rushed.
cheers